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From "Branimir Lambov (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9999) Improve usage of HashMap and HashSet in NetworkTopologyStrategy
Date Fri, 15 Jan 2016 08:10:39 GMT


Branimir Lambov commented on CASSANDRA-9999:

The patch is fine, but it's made obsolete by CASSANDRA-10200 for 3.2+. Is this needed for

> Improve usage of HashMap and HashSet in NetworkTopologyStrategy
> ---------------------------------------------------------------
>                 Key: CASSANDRA-9999
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Tommy Stendahl
>            Assignee: Tommy Stendahl
>            Priority: Minor
>         Attachments: 9999.txt
> In NetworkTopologyStrategy there are HashMaps and HashSets created with a specified initial
size. I assume that this is done avoid having them re sized then when objects are inserted
to them. Unfortunately they are created with the size of the expected number of object that
will be inserted into them. Since the default load factor is 0.75 this will almost guarantee
that HashMaps and HashSets are re sized, to avoid re size the initial size should be set to
"no of objects / 0.75 +1".
> Since this is done every time calculateNaturalEndpoints() is called this might have some
performance impact.

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